published January 15, 2022
⚠️ A rogue JavaScript snippet can cause a segmentation fault! By messing with Hermes' async functions, attackers can trigger unexpected crashes — think of it as a sneaky prank that goes horribly wrong. 🔥 Imagine a restaurant where the chef suddenly tries to cook with expired ingredients that don't belong in the recipe. The meal ends up chaotic, leading to kitchen disasters and a disgruntled dining experience — that's what happens when invalid JavaScript interacts with non-async functions in Hermes! While the chances of Remote Code Execution (RCE) are low, a well-timed invalid code can still lead to a segmentation fault, crashing applications unexpectedly. This could disrupt services and frustrate users, making it a surprisingly sneaky issue to overlook.
Imagine a restaurant where the chef suddenly tries to cook with expired ingredients that don't belong in the recipe. The meal ends up chaotic, leading to kitchen disasters and a disgruntled dining experience — that's what happens when invalid JavaScript interacts with non-async functions in Hermes! This vulnerability occurs in Hermes versions prior to v0.10.0, where invalid JavaScript code can invoke generator functions incorrectly via await and yield calls on non-async/non-generator getters/setters, leading to type confusion errors.
While the chances of Remote Code Execution (RCE) are low, a well-timed invalid code can still lead to a segmentation fault, crashing applications unexpectedly. This could disrupt services and frustrate users, making it a surprisingly sneaky issue to overlook. To protect your applications, update Hermes to version v0.10.0 or later immediately. Additionally, review your JavaScript code to ensure valid async patterns are consistently applied, reducing the risk of triggering this error. 🛡️ You've got this! Follow these steps, and you'll keep your systems running smoothly! 🌟